/Engine/Source/Runtime/CoreUObject/Public/Serialization/BulkData.h
Initiates a new asynchronous operation to load the dulkdata from disk assuming that it is not already loaded. Note that a new asynchronous loading operation will not be created if one is already in progress.
True if an asynchronous loading operation is in progress by the time that the method returns and false if the data is already loaded or cannot be loaded from disk.
bool StartAsyncLoading()